/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-web-praise nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.sri.ai.lpitools.executionengine.server.callback;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Vector;

import org.apache.log4j.Logger;
import org.apache.xmlrpc.XmlRpcException;
import org.apache.xmlrpc.client.XmlRpcClient;
import org.apache.xmlrpc.client.XmlRpcClientConfigImpl;

public class CallBackClientImpl implements CallBackClient_Interface{
	
	private static final Logger logger = Logger.getLogger(CallBackClientImpl.class);
	private XmlRpcClient client;
	private String url;
	
	public CallBackClientImpl(String url) throws MalformedURLException{
		setUpClient(url);
	}
    
    /**
     * Function to set up a client with given server url
     * @param serverURL
     * @throws MalformedURLException
     */
	private void setUpClient(String url) throws MalformedURLException{
	    //set up client with given url
		logger.info("Set up call back client with this url " + url);
		this.url = url;
		XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
		config.setServerURL(new URL("http://" + url));
		client = new XmlRpcClient();
		client.setConfig(config);	
	}
	
	/*
	 * (non-Javadoc)
	 * @see com.sri.ai.lpitools.executionengine.server.callback.CallBackClient_Interface#addNode(java.lang.String, java.lang.String)
	 */
	public String addNode(String treeNode, String clientID) {
		Object resultCall = null;
		String result = "ERROR";
		Vector<String> paramModel = new Vector<String>();
		paramModel.add(treeNode);
		paramModel.add(clientID);
		
		try {
			//call setup remote service 
			resultCall = client.execute("CallBackServer.addNode", paramModel);
		} catch (XmlRpcException e) {
			logger.error("Error could not connect to a server " + url, e);
		}	
		
		//if we get something back check what the result was
		//if we get result then check what it is
		if(resultCall  != null){
			String returnedString = (String) resultCall ;
			if(returnedString.equalsIgnoreCase("recieved_"+treeNode)){
				result = "good";
			} else {
				logger.warn("Remote server returned following string: " + returnedString);
			}
		}
		return result;
	}

	/*
	 * (non-Javadoc)
	 * @see com.sri.ai.lpitools.executionengine.server.callback.CallBackClient_Interface#updateTime(java.lang.String, java.lang.String)
	 */
	public String updateTime(String step, String clientID) {
		Object resultCall = null;
		String result = "ERROR";
		Vector<String> paramModel = new Vector<String>();
		paramModel.add(step);
		paramModel.add(clientID);
		try {
			//call setup remote service 
			resultCall = client.execute("CallBackServer.updateStep", paramModel);
		} catch (XmlRpcException e) {
			logger.error("Error could not connect to a server " + url, e);
		}	
		
		//if we get something back check what the result was
		//if we get result then check what it is
		if(resultCall  != null){
			String returnedString = (String) resultCall ;
			if(returnedString.equalsIgnoreCase("recieved_Step")){
				result = "good";
			} else {
				logger.warn("Remote server returned following string: " + returnedString);
			}
		}
		return result;
	}

	/*
	 * (non-Javadoc)
	 * @see com.sri.ai.lpitools.executionengine.server.callback.CallBackClient_Interface#addBundledTreeNodes(java.lang.String)
	 */
	public String addBundledTreeNodes(String bundledNodes, String clientID) {
		Object resultCall = null;
		String result = "ERROR";
		Vector<String> paramModel = new Vector<String>();
		paramModel.add(bundledNodes);
		paramModel.add(clientID);
		try {
			//call setup remote service 
			resultCall = client.execute("CallBackServer.addBundledTreeNodes", paramModel);
		} catch (XmlRpcException e) {
			logger.error("Error could not connect to a server at " + url, e);
		}	
		
		//if we get something back check what the result was
		//if we get result then check what it is
		if(resultCall  != null){
			String returnedString = (String) resultCall ;
			if(returnedString.equalsIgnoreCase("recieved_Bundle")){
				result = "good";
			} else {
				logger.warn("Remote server returned following string: " + returnedString);
			}
		}
		return result;
	}

}
